Cognitive - Is anyone experiencing this

[MJo]

I finished chemo in May 2006 and Herceptin in November 2006, so I'm two years past chemo and 1 1/2 years past Herceptin. I write for a living -- business writing, grant proposals, reports, etc. I don't write as fast or think as fast as I used to. I don't focus/concentrate as well either. I used to be a "turn-around" writer, able to get a document out fast. That's very hard for me today. I suspect it's a side effect of chemo; however, I've also changed my attitude about work in general. Life is too important to stress myself. Has anyone experienced this? I am going to discuss it with my oncologist. I actually wonder if I should try Ritalin. I am not performing on the job the way I used to. My boss is supportive, but I m worried. Wondering if i should switch to something that doesn't require writing. I'm only 57 and used to love my work enough that I never wanted to retire. I feel differently now and would stop if I could (but I can't). Don't know if I have cognitive damage or if it's my new philosophy or both.